Gryroscopic compass.



J. TOYOKAWA.

GYROSCOPIC COMPASS.

APPLICATION FILED DEC.2I. m4.

1,,23$:r,5f52-'7 Patented July 17, 1917.

. 2 SHEETSSHEET 1.

IIHIIIHH Ill! III III]! WITNESSES //v vs/v TOR Jurja Toyo kowa ,QLz 4 r A TTORNEYS "Harman stmras ara as onivioa.

JUNYA TOYOKAWA, OF TOKYO,v JAPAN.

GYROSCOPIC COMPASS.

Specification of Letters Iatent.

' Application filed December 21, 1914. Serial No. 878,290,

the axis of rotation of one of them is constrained to move in a horizontal plane and that of the other of them is constrained to move in a vertical plane while being also constrained to move in the same horizontalplane as the first mentioned wheel, the axis of'which when the system is held by gravity, will, in a position of equilibrium, point to the celestial pole whilethe axis of the other wheel will point 3 the N.-'S. direction.

The objects of my invention are firstly to 'apply the foregoing principle in a gyroscopic compass for finding the N. S.- direction; secondly, to determine the latitude of a given place as indicated by the inclination of the axis of a gyro-wheel to the horizontal; thirdly, to dampen the'oscillation, by a flexible connection, between the two gyro-wheels so as to cause some torsional 0s cillation about the vertical axis and absorb the energy of this oscillation in a suit-. able resistance; fourthly, to dampen the oscillation by means of a' suitable resistance applied on the horizontal axis by which the axis of the gyro-wheel is constrained to 7 move in a vertical plane; fifthly, to correct the deflections of an ordinary gyroscopic compass, for a given latitude, instead of using the gyro-wheel whose axis of rotation is constrained to move in a horizontal plane in the saidarrangement, by turning the axes ofthe,,twogyro-wh'eels about the vertical axis relatively to each other according to the,- inclination of the axis .of-the gyro-' wheel whose, axis of rotation is constrained to move in a vertical plane; and sixthly, to simplify the aforesaid arrangement in such manner that the revolving axle I of the ro-wheel, whose axis of rotation is constrained to move in a vertical plane, is slightly inclined to the vertical so as to produce a suitable approximate displacement about the vertical axis, corresponding to the deflections due to latitude caused between the axes of the gyro-wheels accord ing to the inclination of the axis of the gyro wheel whose axis of rotation is constrained to move in a vertical. plane.

In order that my invention may be clearly understood 1 .Wlll. describe same fully with reference to the accompan'yiing drawings,

wherein 1 Figures 1 and 2 illustrate the principle or.

whole system of this invention, and. show the side and front 'vlews respectively.

4 Figs. and 4 show the side and front- Patented J lily 1'7 191?.

In Figs. 1 and 2, the axis of the first gyro-wheel 1' is constrained. to move in a horizontal plane, that is, having a two-degree freedom of movement, while that of the second gyro-wheel 2 is constr'ainedto moi e in a vertical plane while being also constrained to more in the same horizontal plane asthe wheel 1 that is, having a threeegreefreedom of movement. When the fr me-casing or housing, carrying the said gyro-wheels is held by gravity, or by other suitable means, for the aforesaid purpose, the axis of wheel 1 will begin to turn to N. S. direction as in the ordinary gyroscopic compass, but wheel 9 will resist this motion of the whole frame while at the same time being enforced to turn angularly inv a vertical plane because of gyroscopic resistance and precession of wheel 2 until the turning momentof wheel 1 gains on its component on a horizontal plane. These mo tions will continue and be repeated, that is, they willoscillata If the energy required for. these oscillations be absorbed, the whole system will quickly settledown, and the axis of wheel 1 will point to the N. S. direction and that of wheel 2 will point to the celestial ,pole, because the axes of gyro-wheels makes termine the latitude, and to fix the axis of the said gyro-wheel in correct relation, in case of the ordinary gyrosooplc compass (which requlres correction for a .given latitude) being used in place of the aforesaid first gyro-wheel. (This will be further ex plained later.) Again the determination of the latitude is effected by means of a dial 4:, attached to the axle which carries the casing of wheel 2.

As shown in Figs. 3 and l, the system of my invention can be used to dampen the oscillations of the wheels by a flexible conmotion between the two gyro-wheels 5 and 6 about the vertical axis by holding casing oscillations of the gyro-wheels will take place as in the first described arrangement,

while at the same time these oscillations cause the oscillatlon between casing 7 and 'frame 9, and it will be absorbed in some suitable resistance, and the amplitude of these oscillations will be continually diminished and the axes will settle down into a position of equilibrium.

A very simple method for damping is to apply a suitable'resistance to the axle which supports the casing as in the first arrangement.

In an ordinary gyroscpoie compass the damping of the oscillations is efi'ected by the gyro-wheel during its vertical oscillation, and such damping arrangement introduces the deflection due to latitude. My present invention avoids this trouble. In case of the ordinary gyroscopic compass being used, which requires a correction due to latitude, in place of the first gyro-wheel, it is necessary to turn the axes of the two gyro-wheels relatively on the horizontal plane, the amount of deflection corresponding to the inclination of the axis of the second gyro-wheel, in order to obtain the correct N. S. direction. As shown in Figs.

ti, 6, 7 and 8 the movement of cam 14 which is fixed on the turning axle of wheel 13 transmits motion to lever 15,-which turnsformed, I declare that what I claim is:

1. A gyroscopic compass consisting of gyro-wheels, the axis of rotation of one of which being constrained to move in a horizontal plane, and that of another being constrained to move in a vertical plane and also in the same horizontal plane as the first named wheel, said axes, when in equilibrium always pointing, respectively, to the North-South and to the celestial poles.

In a gyroscopic compass for determining latitudes, gyro wheels respectively having two degree and three degree freedoms of movement, the axes of said wheels, when in equilibrium, always pointing, respectively, to the North-South and to the celestial poles, and a scale member associated with the gyro-wheel having a three degree freedom of movement.

3. In a gyroscopic compass, gyro-wheels respectively having two-degree and tl1ree-degree freedoms of n'iovement, a flexible connection between said gyro-wheels to cause torsional oscillation about the v'ertical axis,

and a resistance to absorb the energy of such oscillation.

l. In a gyroscopic'compass, gyro wheels respectively having wo-degree and three degree freedoms of'lnovement. the axes of said wheels, when in equilibrium, always pointing, respectively, to the North-South and to the celestial poles, and means tdabsorb the energy of precession of said wheels to.bring them quickly to a state of equilibrium.

In testimony, that I claim the foregoing as my invention, I have signed my name in presence of two subscribing witnesses.

JIINYA TOYOKAVVA.

Witnesses I'IENRY B. HITCHCOGK,

v GENJI IxURIBARA. 

